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第2920章

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一秒记住【笔趣阁】
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    “关中平原西起宝鸡县,南至渭南,北靠黄土高原,南接秦岭,东西长六百里、南北长一百五六十里,面积至少五十四万顷,是汉中平原的十倍以上。
    境内有渭河、泾河、沣河、北洛河等河流,也能用于灌溉,有着八百里秦川的称号。
    境内耕地面积具体多少我不知道,但估摸着两三千万亩应该是有的吧。
    既然汉江能采用南水北调层层转运的方法灌溉汉中平原,那西安一带的关中平原是不是也可以采用这种方法。
    哪怕是亩产一石,那一年也能产出两三千万石的粮食,也足够全陕西百姓所有了,余下的还能支援山西、河南。”
    李若涟等几名武将眼睛一亮,看向宋应星的眼神满是期盼。
    韩癀和宋应星对视了一眼,然后相视苦笑了起来。
    崇祯见状脸色略显凝重,沉声道:“朕刚刚也是有这个想法,但看两位的神色似乎有些不可行?”
    “陛下,实不相瞒,在我们接到陕西送回奏疏后,内阁六部商议的时候,户部毕尚书就提出了这个想法,我们也认为似乎是可行。
    但到陕西的这段时间调查后发现此事是我们想的太过于简单了。”
    宋应星神色严肃:“首先,面积太大了,从渭河到汉中平平原北面的铜川边缘差不多一百三四十里地,宝鸡到渭南六百里,南北如此宽,沿河至少每隔百米就得一条水车群。
    渭河比铜川低很多,南北两百米就得一座高台,粗略算下来至少得十八万座水车,如此庞大的水车数量,短时间内根本就办不到。
    且需要七万两千里长的水桥来运输,这得多少毛竹和支架?
    一时半会儿的到哪里去弄这么多毛竹?即便是有这么多毛竹,想要铺设好至少也得三个月以上的时间。
    其次,一座水车至少需要两人倒班,这就需要三十六万劳力,哪里找那么多劳力?整个西安府也不过一百二十万百姓。
    若是都抽调了,将会极大的影响整个西安府的社会秩序。
    第三,渭河处于秦岭以北,其支流流经黄土高原,流域内土质疏松,以至于含沙量太高了。
    臣去称过,渭河平均一千斤水中有沙子百斤左右,而汉江则是一千斤中有半斤沙子,两者相差两百倍左右。
    如此大的含沙量若是水桥斜坡缓了,沙子就流动不了,容易堵塞水桥,若是陡峭,那么水塔、水桥和水车势必要增加很多。
    现在大旱如此严重,可不是只浇一次就可以的,需要多次浇灌,如此大含量沙的水浇地,那直接将地都盖上一层,种子还怎么发芽?
    而且关中平原土壤是黄土,大量含沙的水浇下,直接将土壤结构都改变了,现在倒是有收获了,大旱过后怎么办?
    第一条所需的毛竹若是在汉中平原可以换成普通的绿竹、黄竹等等,大不了多多做几座水桥,都是顺手的事儿。
    而且两种竹子北方也是极多的,能短时间得到。
    可因为含沙量太大,容易堵塞竹子通道。
    第四,汉江在秦岭以南,高大的秦岭挡住了寒流,又在大巴山之间,气候温和,所以汉江没有结冰期,而渭河在秦岭以北,天气寒冷,则是有结冰期。
    小麦虽然耐寒,但不意味着不怕冻,现在冬天不下雪,就肯定得浇水,一次性渗透下去那么多冰水,会让根系冻坏,影响生长,进而减产。
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